Motor controller is a device that improves the performance of an electric motor in a prearranged manner. Motor controllers can include an automatic or manual means for starting/stopping the motor, choosing forward/reverse rotation, selecting and controlling the speed, modifying or limiting the torque, and shielding against faults and overloads. The major constituents of electric vehicle systems are the motor, power supply, controller, drive train and a charger. An EVM controller or electric vehicle motor controller is a machine that is employed to regulate the torque generated by the motors of electric vehicles by means of modifying the energy flow from the power sources to the motor.
Control of an electric vehicle is time-variant; for instance, the operating parameters of EV and the condition of the road vary. Hence, the controller must be intended to make the system adaptive and robust. This is achieved by developing the system on both dynamic as well as steady state performances. Presently, the key factor limiting the wide-spread use of electric vehicles is the diminutive running distance for each battery charge. Therefore, besides regulating the performance of vehicle, considerable efforts have to be made so that the EVM controller does not consume high energy to the energy management of the batteries on the vehicle. Technological advancements have led to the development of such energy efficient EVs that in turn is likely to fuel the global electric vehicle motor controller market in the coming years.